Electra LEX 12, Service Manual

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12-33
CONTROL SYSTEM
Revision Y06-01 Service Manual - LEX
12.17 System Diagnostics
Pressing Mode button for 5-10 seconds in SB or any other operation mode will
activate diagnostic mode by the acknowledgment of 3 short beeps and lighting of
COOL and HEAT LEDs.
In diagnostic mode, system problems will be indicated by blinking of Heat & Cool
LEDs.
The coding method will be as follow:
Heat led will blink 5 times in 5 seconds, and then will be shut off for the next 5
seconds. Cool led will blink during the same 5 seconds according to the
following table:
No Problem
ż ż ż ż ż
1 RT1 is disconnected
ż Ɣ Ɣ Ɣ Ɣ
2 RT1 is shorted ż Ɣ Ɣ Ɣ ż
3 (Reserved)
ż Ɣ Ɣ ż Ɣ
4 RT2 is disconnected Ɣ ż Ɣ Ɣ Ɣ
5 RT2 is shorted
Ɣ ż Ɣ Ɣ ż
6 (Reserved) Ɣ ż Ɣ ż Ɣ
7 RT2 temp reading doesn’t change
Ɣ ż Ɣ ż ż
8 RT3 is disconnected Ɣ Ɣ ż Ɣ Ɣ
9 RT3 is shorted
Ɣ Ɣ ż Ɣ ż
10 (Reserved) Ɣ Ɣ ż ż Ɣ
11 RT3 temp reading doesn’t change
Ɣ Ɣ ż ż ż
12 RT2 & RT3 temp reading doesn’t change Ɣ ż ż ż ż
ż - ON, Ɣ - OFF
Notes:
1. If faults occur in more than one thermistor (except case number 12 on the table
above), only one fault will be indicated according to the following order: RT3,
RT2, RT1.
2. A/C will jump out to normal mode if sending a command by the R/C in the
system diagnostics mode. If this command from the R/C contain a Group ID, this
ID will become the new Group ID of the ELCON unit.